Illinois transportation officials have announced locations along interstates where the speed limit will increase to 70 mph.

The Illinois Department of Transportation says about 87 percent of interstate highways and 98 percent of rural interstates under its jurisdiction will be increased to 70 mph. A new law takes effect Jan. 1 increasing the maximum speed limit on Illinois interstates to 70 mph.

Transportation officials urge motorists to obey posted speed limits. They say the 70 mph speed limit will be in effect on segments of Illinois interstates that can accommodate the higher speed while maintaining safety.

About 28 percent of the Illinois Tollway’s 286-mile system will be increased to 70 mph.